Power hammer



Jul 5, 1927.

I H. H. MILLER Filed Feb. 10. 1925 1 :1 v

POWER HAMMER 2 Sheets-Sheet flq 11- 10 1 44 45 WlfNE SS J2 15m fl 2A 3 6 7 9 12 11 v 4 10 1 17 a 1 AT 15 1 22 16 16 B 16 Y .86

F 3 1r v3;? 33 M .34

35 1s 35 as as "1 56 7 INVENTOR 4.9. 50 5 hi7?" /7///7' 16 4 I July 5, 1921.

H. B. MILLER POWER HAMMER Fil ed Feb. 10.- 1925 2 Sheets-She 2 WITNESS as given mechanism will automati ally andqpera- Patented JulyS, 1927; I MTED STATES. PATENT OFFICE.

nAeRY MILLER, or Younesrown; orri -o, Assre roa T MILLER-SMYTHE EnEo'rRIo COMPANY, or YOUN S O N, euro. Y

rowrm HAMMER.

Application filQQLEQD EQ F-Y' 9,. 925; Serial; 11 3,16%

My invention relates to power hammers of cally disconnected from the pereussionmemwhat are knownas the percussion type, op ber. i erated preferablythough; not necessarily, Qther objects and advantages o t my inby an electric motor as the prime mover, Vention will be apparent to "those skilled inand adapted for the pi; poses of riveting, the.art, troni, thedescriptionhereinaiterfol 60 chipping, drilling, t

or similar'purlowing. poses: by means at luv et set, chiseh d rill, Referring: to the drawings "in Which'like tam-per: bar or. the like to 013,6 end Of hi h r IQI ,Q h i t i 6, like pa th s ussion ineinberofthe power hammer l, is. a. longitudinal part sectional vieW of 10 delivers it blew. v I the hammer; portions or the mechanism 65 The 1 F 1 f my i ti i t provide being showninsection to more Clearly illusa tool of the chalE i-Ctei: above referred to, trate the invention in this View the percuswhich is simple, light, compact and ell s n' e'r 0t thefhamrnr' is. illustrated in balanced, and which, whilst giiging the greatits estren'le inward position. Fig. 2 is a est efficiency possible, may be cheaply consinnilar sectional View of a portion or" the structecl. i s iow e th 12 190 011 m m i Another object of my invention is to pro.- its. \it1fc1ne outward position; Fig. 2 is, a ride a structure at such character having similar sectional yiewiof a tio of th the. parts so arranged to 'permi -tot ready hammer showing the percussion member in repair or replaeen ent ,n case such repairs its position when pressed against the worl;

or replacement b c m nec ssary 7 P N- 1 1 i 3 1 f' A turther object oi my invention is to View of a p' ortionfof the hammer showing provide a device Off this character which, 7 the mechanism as it is about to more the whilst simple and eiiiciont, Will he reliable percussion] member from' its position as and not liable toget out of order, and this shown in V 4- is an enlarged secs object I attainonot only by the reduction ioilal View, showing the percussion member of the number of parts, but also. in thesimand a portion of the mechanism "for operplicity of the parts and the combination at ng it in one'ol its extreme positions in he eof p full lines and'its other extreme position in dot so A bj t f my i t on rs Whilst and dash lines, other parts ofthe tool being deliver he" hardest blows possible, to omitted to more clearly illustrate this p or- Tease the, number of blows per unit. of t l1 f the ilIYQ iOW Flg- 5 1s a e V w. '0 the utmost, and in this Way obtain of this portion of the percussion member from the han'imer the raximurn duty in a and operating mechanism; 6 is a like time. view with hepe 'qussion mbe r moved? Anoth r. object 035 my invention is to pro- Flg= 7 is at SS- Sectional View taken on the vice a p. his power hammerhaving a per-' line 6.'6 '0, Fig. 4 Fig. 8 is a sectional cussion member which movable by pow r View taken ntlie lines 8j-'"8 of Fig. 1, and devices, one, of which is adapted to be auto- F12}. 9. i Se i al View similar to Fig. l

u inatically and alternately connected and disof a modification oi the invention. connected with the percussion member. Referring now in [deta l tothe draw ngs,

Another object oii'myinvention is to prothe reference character 1, indicates the casvide a portable power hammer having a ingot the harm hich casing maybeof percussion member and a driving gear, ny snitabl shape and may be of any suit- I which are alternately connected and discoiiable, 'const notion," In the present? enreodii- 10o necked through the. medium of a bodily moy- 'ment of the, invention an operators handle able member; 1 e i 2 s f .mfid. ll Q find Q'li ll l gi bllt e i fi Q1? y tiea t me i B undelistee he? this he i l e'e y vide a porver'lialilmlf ie w i h, thef lrir e a ,sle i any other s mblep m W 1 the casing 1 d se the? he? uita le ro e tiifely engage. the percussion n er when i the hammer is pressed by -;he operator v ansin ttmg device, is proagainst the object to heopera ecl on and when i idegl may be con oiled by suitable sch pressure *is relievedfthe drive nec iaadjadfllifi tll OP@I K QQFSliandlefl, In

so res to op rate but is 'autemai ERPQ P: llb l l tqf fle We, a i

electric motor (not shown in the drawings) is employed, which is controlled by a switch having an operating'button or lever 3 located adjacent the operators handle, it being understood that a relay may be substituted for the switch for use in such cases as distant control of the tool is desired.

The armature shaft of the motor (not shown in the drawings) is suitably journalled within the casing 1, and at one end has attached thereto a short shaft 1 which is preferably mounted in an anti-friction bearing 5 mounted in a member 6 secured in the casing. This shaft 4 extends from the end of the armature shaft through the bearingv 5 and at its end is provided with a gear wheel 7 ,-the teeth of which mesh with the teeth of a gear wheel 8 secured to a r0- tatable shaft 9 which extends in a direction across the casing 1 and having its ends mounted in anti-friction bearings 10 suitably mounted within the casing 1. Intermediate its ends there is mounted on this shaft an eccentric disc 11 which is rotatable with the shaft. This disc is surrounded by an eccentric strap 12 which is operatively connected with the disc 11 through the medium of an antifriction bearing 13 or any other suitable bearing. The strap 12 is provided with a trunnion 14 upon which one end ofa member 15 is loosely mounted. Beyond the trunnion 1 1- the member 15 is preferably of T form in cross section and is slidably mounted in a T-shaped slot formed in a bearing member 16 which is suitably secured in the casing against movement. The lower end portion of this member is provided with an inwardly extending projection 17, the purpose of which will hereinafter be more fully set forth.

Beyond the eccentric a percussion member 18 is provided which is preferably arranged centrally of one of the end portions of the casing 1. One end of this percussion member and the member 15 are operatively connected and disconnected through the medium of a bodily movable member which, in the present embodiment of the invention is in the form of a roller 19. This roller is preferably in the form of a spool having spaced enlarged circular end portions 20, one of which is mounted on each end of a circu lar cross piece 21 of less diameter than the end portions. The inner portion of the percussion member has formed therein an opening 22 in which the spool 19 is mounted, such opening being slightly wider than the width of the spool. The sides of the opening are provided with Ways or bearing surfaces 23 upon which the periphery of the end portions of the rollers are adapted to roll or slide The surface 24 formedon the percussion member above the surfaces 23 constitute a bearing surface upon which the peripheries of the end portions 20 of the spools are adapted to roll or slide. It will here be noted that the distance between the surfaces 23 and 2 1 is slightly greater than the diameter of the end portions 20 of the spool so that the spool is freely movable in a direction across the percussion member and at the same time is prevented from moving in any other direction relative to the 27 in one direction. The end portion 29 of the member 27 engages the cross piece 21'of the roller. and this member is adapted to move the roller in one direction.

The projection 17 extends into the openin 22 and is adapted to engage with the cross piece 21 of the roller to move the percussion member in one direction longitudinally of the casing 1. On each side of the member 15 there is provided a block 30 which is secured to the bearing member 16 and with which one of the end portions 20 of the roller is adapted to engage to move the roller across the percussion member in the direction of the arrow in Fig. 8. The face portions 31 of these blocks 30 are curved or tapered for a portion of their length so that as the percussion member is moved in one direction the end portions 20 of the roller will engage this surface and will be gradually forced across the percussion member until such time as the roller has been moved over this surface a sufiicient distance that the dead center of the cross piece 21 has been. moved beyond the end of the projection 17 of the member 15 to the posit-ion as illustrated in Fig. 1 of the drawings.

Beyond the roller 20, the percussion member 18 is slidabl-y mounted in a member 32 secured within the casing 1, which member not only forms a bearing for the percussion member, but also forms a spring seat 33 for one end of a spring 34, the opposite end of this spring being seated on a spring seat 35 formed on or secured to the percussion member. By turning the screw threaded member 32 forward or backward the initial amount of compression on the spring 3 1 may increased or decreased. Beyond the spring seat 35 the end portion 36 of the percussion member is slidably mounted in a tubular member '37 which is secured within the end portion of the casing 1. This por The outer end 7 and shaft. Otto. revolve.

daamerer or he e -non that" Surrounds the.

seat 35, th s proyiding'. ainnultir shoulder 38 on which is mounted a stop or rest" means 39;,which may be in theforrh of" a metal ring: 40 moiinted in the casing"; such ring having. ztflfibei ring mounted therein with which the ii'liclei stiifac'e of the spring seat 35' of the percussion member is aflcl'apted to engage it beingunderstoOd',however, then any other suitable stop means may be 8111- portion. is provided. with. e spring seat. 47,.

one side of, which. isradapted. to. engage a shoulder i8 formed in the casing n'hd theopposite side forms a spring'se'at 49 for on end of it spring 50,. the opposite end of 511011 spring seating on theinner surface 51. of a 111"1111QQ1 52 which is securedto the forward end of the cit-sing '1'.throngh the medium of screw threads or any other suitable means.

Assuming the mechanism of the invention to, be in the position es shown in. Fig. 3. of drawings,i,e.,.the tool t5.pressed against the work: to beoperated on and. itis desired to operate the hammer, the operator presses the lever. or btitt on. gwhich. closes the electric circnitbetweeh the electrical, sonrce of supply" and the mo to'r', causing the armature shvt't and shaft 1,- the pinio'n .7,, gear wheel 8 that the diameter of the gear wheel 8 is greater than the diameter of thepii'iion'l, thus causing geziif wheel ziiid shift 9 to revolve at less speed than. the speed of the she-ft 4: and pinioii 't'; the shaft 9' re:

valves the eccentric" disc 1-1 is revolved with it, wl1ic1 1 .causesv the eccentric strap 12 to btz te andat the seine time Home in, the. di-' rect on of the length of the cesrng as indi- '5 thereof; is sen edis eiice heck of the front edge of such -pro e ct on, thiis" preventing 5510- cinema-1 emretion. of. thereHer ind ihe'iiiber h the peripheries if. the are in engage i en wiflithe It will here be noted of the cross piec'eQl is such,

other portions of? the peripheries are in en- 16, as illustrztte'd in Fig; 4'- of: the drawings. the member 1-5 ismoved in the direction ofthe arrow A' therol'ler 19 and percussion. member 1:8{wi11 be moved in thesmne direction and as they are thusmo'ved the end porhens- 0f the roller will engage the curved or tapered portions fthe surfaces 31' of the lne'lnbers which engagement and continned rnoven'ient' oi? themember 15' causes the roller. to be moved in at direction across the percussion member a-s indicated by the arrow B in Figs. 3' and" 4t until the roller has been moved to; such a position that the dead center of. the cross piece-21E isjju'st beyond the end ofthep-rojeetioir 17-,{a's shown in 1 and 4. At this time thespri n'g 34 which-has been compressed will force t1 1e' percnssion member forwa and the striking face e2 tllere'of will strike the i'nnei 'ei id of the tool with great, force, thus delivering a' heavy blow through the toolf to' the n t-arterial worked; on. As the roller is being moved bodily from the projection; 17 the member 28 isbe-' ing lIIOVCt in the same direction causing the resilient member 27 to hecon-reficohmressed, which sprm-g,- so eolnp-ressed, will when the percussion member has been released,"tend to force the member '28 and rolleragtiinst the end of the projectioh 17 as shown inFig. 2

of the drawi s. As the sl ifaft 9' and other parts of the drive mechanism continue to operate, the eccentric strap 12 will fo'rce the member-"15'- the direction as indicated by the arrow C in Fig. 2 and as the surface 53 of the projection 17 passes the cross piece 21 of the roller, thesjor'i'ng' 27, through the medium of the member 28 will force the roller in a direction across the percussion member at sufficient dist-(Trice that the cross piece will again, rest on the sii rtace 53 of the projection 17, is shown in Fig in which position the mechanisms will now repeat the operation; hereinbefore described. When the operator moves-the powe'l'fhaimner from one paiftof the work being operated on to another m and it is undesirable to shut ofi the electric current ahclstop' the motor,

the relievin of the" pressure on the tool will permit the percussion member 18 and too1 45 to move forward a snfiie'int distance, so that the cross piece- 2 1 of the i oller will be in such :1 position that the member 15 win contifiiie to reciprocate,- but the position v p r the suifftce 53 of thepeit-idii 17 cam-iotengage the-re with, until the tool 45 is pressed Again-stv the work operated on, which causes the r6 01 .455 and percussion member 18' to be iiiofid inwaidl'ya sufiieieiit distahc'e sotliat the iiijdeis ide er the ci'oss piec'e 21 will be in 53,'whe11 the spring '28 and member 29 wi11 move he s es 'p e 2. un l it -set le 's'iihstahtiallythe same plane asthe surface IN In surface 53 as shown in Fig. 3 of the drawings, at which time the tool will continue to operate as hereinbetore described.

The spring which passes around the tool is for the purpose of retaining the tool in its extreme inward position in the casing, so that the inner end of the tool is, before it is struck by the percussion member, in

such position that it will receive the full force of the impact of the percussion member. The combination of tool 45, spring 50, spring seat IT, and threaded end member 52 is such as to prevent the tool from being accidentally shot out from the hammer at such times as the tool is not in contact with the work to be operated on.

In Fig. 9 of the drawings a modification ot the invention has been illustrated in which a flat spring 55 is employed for en gaging and moving the roller. The operation of this modification is substantially the same as described in connection with the preferred form hereinbefore described.

It will be understood that the member 19 which has been described as a roller or spool may be of any other suitable form so long as it may slide or roll bodily to connect and disconnect the percussion member 18 and member 15.

It will be apparent to those skilled in the art, that changes may be made in the details and arrangement of the several parts torming the invention without departing from the spirit and scope of the appended claims.

Having thus described the invention, what .I claim as new and desire to secure by Let tcrs Patent is 1. In a power hammer, a percussion member, a reciprocating drive mechanism, and bodily movable means for alternately connecting and disconnecting said member and mechanism, said means being out of operative connection with said drive mechanism when said percussion member and mechanism are disconnected.

2. In a power hammer, a percussion memher, a reciprocating drive mechanism, and bodily movable means in said percussion member for alternately engaging and disen gaging with said mechanism, said means being movable in a direction through said percussion member.

3. In a power hammer, a percussion menber, a reciprocating drive mechanism, means mounted in said percussion member but not secured thereto. for alternately connecting and disconnecting said member and mechanism.

i. In a power hammer, a percussion memher, a reciprocating drive mechanismand means for automatically and alternately connecting and disconnecting said member and mechanism, said means comprisinga member movable bodily across said percussion member.

5. In a power hammer, a percussion member, a drive mechanism comprising a member movable in the direction of its length and means on said percussion member, movable relative to said percussion member into and out of engagement with the last mentioned member for alternately connecting and disconnecting said percussion member and drive mechanism.

6. In a power hammer, a percussion member, a reciprocating drive mechanism, and a roller mounted in and movable across the percussion member for alternately and directly connecting and disconnecting said percussion member and mechanism.

7. In a power hammer, a percussion member, a reciprocating drive mechanism, a bodily movable member in said percussion member for alternately and directly 'connect ing and disconnecting said percussion member and mechanism, and means for automatically moving said bodily movable member.

8. In a power hammer, a percussion member, a drive mechanism comprising a slidable member, and means carried by said percussion member movable relative to said percussion member alternately into and out of engagement with said slidable member.

9. In a power hammer, a percussion member movable in the direction of its length, a drive mechanism having a portion movable in the direction of its length, and means mounted in the percussion member movable in a direction at an angle to the direction of movement of said percussion member and said portion of said mechanism to alternately connect and disconnect said percussion member and mechanism.

10. In a power hammer, a percussion member, a drive mechanism comprising a reciprocating member, a member on said percussion member movable into and out of en gagement with said reciprocating member, means on said percussion member for moving the member on said percussion member in one direction and means adjacent said reciprocating member. for moving said member in the opposite direction.

11. In a power hammer, a percussion memher, a drive mechanism comprising a reciprocating member, a roller on said percussion member movable into and out of en gagement with said reciprocating member for alternately connecting and disconnecting said percussion member and reciprocating member, and means for moving said roller;

12. In a power hammer, a percussion member movable in the direction of its length, a drive mechanism comprising a re ciprocating member movable in the direction of its length and a member on said percussion member movable in a direction at an angle to the direction of movement of said percussion member and reciprocating membar for alternately connecting and disconnecting said percussion member and reciprocating member.

13. In a power hammer, a percussion member movable back and forth in the direction of its length, a drive member movable back and forth in the direction of its length, and means mounted in said percussion member and movable across the path of travel of said drive member for alternately connecting and disconnecting said percussion member and drive member.

14. In a power hammer, a percussion mem: ber movable in the direction of its length, a drive member movable in the direction of its length, and a bodily movable'member mounted in said percussion member for alternately connecting and disconnecting said percussion member and drive member.

15. In a power hammer, apercussion member movable in the direction of its lengfll, a drive member movable in the direction of its length, and a member movably mounted on said percussion member for alternately connecting and disconnecting said percussion member and drive member.

16. In a power hammer, a percussion member, a-reciprocating drive member, and a spool shaped member mounted in said percussion member and movable in a direction thereacross for alternately connecting and disconnecting said percussion member and drive member.

17. In a power hammer, a percussion member, a drive member, and a member having cylindrical portions of different diameters for engaging and disengaging said percussion member and drive member, one of said portions being engaged by said percussion member and the other of said portions being adapted to be engaged by said drive member.

18. In a power hammer, a percussion member, a reciprocating drive member, a spool shaped member loosely mounted in said percussion member and movable into and out of engagement with said drive member for alternately connecting and disconnectingsaid percussion member and drive member.

19. In a power hammer, a tool, a percussion member, a drivemechanism, and tool actuated means for eiiecting the connecting and disconnecting of said member and mechanism. I

20. In a power hammer, a tool, a percussion member, a drive mechanism, means for connecting and disconnecting said member and mechanism, said connecting and disconnecting being controlled by said tool.

21. In a power hammer, a percussion,

member, a drive mechanism, means for connectlng and CllSCOllIlGCtlhg said member and mechanism as the hammer is applied to or moved from the work being operated upon.

22. In a power hammer, a percussion member, drive mechanism means for connecting and disconnecting said member and mecha nism while pressure is exerted longitudinally of said hammer, and for disconnecting said member and mechanism when the pressure is released.

23. In a power hammer, a reciprocating percussion member, a mechanism for driving said percussion member, and means controlled by pressure through said percussion member for operatively connecting and disconnecting said member and mechanism.

In testimony'whereof I affix my signature.

HARRY H. MILLER. 

